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PROBLEMS/BACKTRACKING/PERMUTATIONS

Permutations Problems

12 Permutations problems on LeetCode, a Backtracking interview pattern, ranked by importance (how often it comes up in real interviews). Difficulty (ELO) and importance shown per problem.

#PROBLEMDIFFELOIMPPATTERNS
1PermutationsEasy124492
Frequency Counting / Hash Map Lookup
2Permutations IIMedium140882
Frequency Counting / Hash Map Lookup · Sorting + Comparison
3Letter Tile PossibilitiesMedium174172
Frequency Counting / Hash Map Lookup
4Permutations IIIPREMIUMEasy138058
Constraint Satisfaction (N-Queens)
5Palindrome Permutation IIPREMIUMMedium155850
Frequency Counting / Hash Map Lookup
+ 7 more Permutations problems, see all in the explorer →
MORE BACKTRACKING PATTERNS
PermutationsCombinations / SubsetsConstraint Satisfaction (N-Queens)String Partitioning (Palindrome Partitioning)Path Finding with Backtracking
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